Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357l...1g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 357, July 1, 1990, p. L1-L4.
Astronomy and Astrophysics
Astronomy
11
Active Galactic Nuclei, Cosmology, Galactic Evolution, Gamma Ray Astronomy, Astronomical Models, Background Radiation, Energy Spectra, Quasars, Seyfert Galaxies
Scientific paper
The source spectra and angular fluctuations produced by various possible models of AGN evolution derived from observations in other wavelength bands are investigated. It is found that the sizes of the angular fluctuations are roughly constant between 10 and 100 MeV, independent of the models chosen. None of the models produce the spectral 'shelf' observed at a few MeV, and from the simulation, the AGN mechanism is only a minor contributor to the extragalactic gamma-ray background (EGB), with its flux only about 10 percent of what is observed. These evolution-independent effects imply that the EGB is not solely produced by the AGN mechanism.
Cline David. B.
Gao Yi-Tian
Stecker Floyd W.
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